Replace character in string/cell with the character above it

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Dora de Jong
Dora de Jong 2021-3-11
评论： Dora de Jong 2021-3-11
String/cell example: --> real string/cell is very long
a= { 'a' ; 'b' ; 'c' ; 'b'}
Wanted outcome:
a_new= { 'a' ; 'a' ; 'c' ; 'c'}

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the cyclist
the cyclist 2021-3-11
编辑：the cyclist 2021-3-11
The general rule is not perfectly clear to me, from your small example. Do you mean that you want the even-numbered elements to be replaced? If so, then
anew = a;
a(2:2:end) = a(1:2:end-1);
If not, maybe you could explain in a little more detail.
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the cyclist
the cyclist 2021-3-11
编辑：the cyclist 2021-3-11
Here is one way:
a = { 'a' ; 'b' ; 'c' ; 'b' ; 'h' ; 'g' ; 'b'};
replace_idx = find(strcmp(a,'b'));
a_new = a;
a_new(replace_idx) = a_new(replace_idx-1);
This will not work if 'b' is the first element, so you will need to modify this algorithm in that case. But you haven't given info on what you want to do then.
Dora de Jong
Dora de Jong 2021-3-11
Thank you so much!!
There is no b as first element, so this works perfect.

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更多回答（1 个）

Jan
Jan 2021-3-11
编辑：Jan 2021-3-11
Maybe:
a_new = a;
a_new(2:2:end) = a(1:2:end);
Or:
index = repelemt(1:2:numel(a), 1, 2):
a_new = a(index)
[EDITED] after your comment: "So every b wil be replaced with the character above it"
index = find(strcmp(a, 'b'));
a(index) = a(index - 1);
What about: {'a'; 'b'; 'b'} or {'b'} or {'b', 'a'}?

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